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   1 /* $Id: sys_sparc.c,v 1.57 2002/02/09 19:49:30 davem Exp $
   2  * linux/arch/sparc64/kernel/sys_sparc.c
   3  *
   4  * This file contains various random system calls that
   5  * have a non-standard calling sequence on the Linux/sparc
   6  * platform.
   7  */
   8
   9 #include <linux/errno.h>
  10 #include <linux/types.h>
  11 #include <linux/sched.h>
  12 #include <linux/fs.h>
  13 #include <linux/file.h>
  14 #include <linux/mm.h>
  15 #include <linux/sem.h>
  16 #include <linux/msg.h>
  17 #include <linux/shm.h>
  18 #include <linux/stat.h>
  19 #include <linux/mman.h>
  20 #include <linux/utsname.h>
  21 #include <linux/smp.h>
  22 #include <linux/slab.h>
  23 #include <linux/syscalls.h>
  24 #include <linux/ipc.h>
  25 #include <linux/personality.h>
  26 #include <linux/random.h>
  27
  28 #include <asm/uaccess.h>
  29 #include <asm/utrap.h>
  30 #include <asm/perfctr.h>
  31 #include <asm/a.out.h>
  32 #include <asm/unistd.h>
  33
  34 /* #define DEBUG_UNIMP_SYSCALL */
  35
  36 asmlinkage unsigned long sys_getpagesize(void)
  37 {
  38         return PAGE_SIZE;
  39 }
  40
  41 #define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL))
  42 #define VA_EXCLUDE_END   (0xfffff80000000000UL + (1UL << 32UL))
  43
  44 /* Does addr --> addr+len fall within 4GB of the VA-space hole or
  45  * overflow past the end of the 64-bit address space?
  46  */
  47 static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
  48 {
  49         unsigned long va_exclude_start, va_exclude_end;
  50
  51         va_exclude_start = VA_EXCLUDE_START;
  52         va_exclude_end   = VA_EXCLUDE_END;
  53
  54         if (unlikely(len >= va_exclude_start))
  55                 return 1;
  56
  57         if (unlikely((addr + len) < addr))
  58                 return 1;
  59
  60         if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
  61                      ((addr + len) >= va_exclude_start &&
  62                       (addr + len) < va_exclude_end)))
  63                 return 1;
  64
  65         return 0;
  66 }
  67
  68 /* Does start,end straddle the VA-space hole?  */
  69 static inline int straddles_64bit_va_hole(unsigned long start, unsigned long end)
  70 {
  71         unsigned long va_exclude_start, va_exclude_end;
  72
  73         va_exclude_start = VA_EXCLUDE_START;
  74         va_exclude_end   = VA_EXCLUDE_END;
  75
  76         if (likely(start < va_exclude_start && end < va_exclude_start))
  77                 return 0;
  78
  79         if (likely(start >= va_exclude_end && end >= va_exclude_end))
  80                 return 0;
  81
  82         return 1;
  83 }
  84
  85 /* These functions differ from the default implementations in
  86  * mm/mmap.c in two ways:
  87  *
  88  * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
  89  *    for fixed such mappings we just validate what the user gave us.
  90  * 2) For 64-bit tasks we avoid mapping anything within 4GB of
  91  *    the spitfire/niagara VA-hole.
  92  */
  93
  94 static inline unsigned long COLOUR_ALIGN(unsigned long addr,
  95                                          unsigned long pgoff)
  96 {
  97         unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
  98         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
  99
 100         return base + off;
 101 }
 102
 103 static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr,
 104                                               unsigned long pgoff)
 105 {
 106         unsigned long base = addr & ~(SHMLBA-1);
 107         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
 108
 109         if (base + off <= addr)
 110                 return base + off;
 111         return base - off;
 112 }
 113
 114 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 115 {
 116         struct mm_struct *mm = current->mm;
 117         struct vm_area_struct * vma;
 118         unsigned long task_size = TASK_SIZE;
 119         unsigned long start_addr;
 120         int do_color_align;
 121
 122         if (flags & MAP_FIXED) {
 123                 /* We do not accept a shared mapping if it would violate
 124                  * cache aliasing constraints.
 125                  */
 126                 if ((flags & MAP_SHARED) &&
 127                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 128                         return -EINVAL;
 129                 return addr;
 130         }
 131
 132         if (test_thread_flag(TIF_32BIT))
 133                 task_size = STACK_TOP32;
 134         if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
 135                 return -ENOMEM;
 136
 137         do_color_align = 0;
 138         if (filp || (flags & MAP_SHARED))
 139                 do_color_align = 1;
 140
 141         if (addr) {
 142                 if (do_color_align)
 143                         addr = COLOUR_ALIGN(addr, pgoff);
 144                 else
 145                         addr = PAGE_ALIGN(addr);
 146
 147                 vma = find_vma(mm, addr);
 148                 if (task_size - len >= addr &&
 149                     (!vma || addr + len <= vma->vm_start))
 150                         return addr;
 151         }
 152
 153         if (len > mm->cached_hole_size) {
 154                 start_addr = addr = mm->free_area_cache;
 155         } else {
 156                 start_addr = addr = TASK_UNMAPPED_BASE;
 157                 mm->cached_hole_size = 0;
 158         }
 159
 160         task_size -= len;
 161
 162 full_search:
 163         if (do_color_align)
 164                 addr = COLOUR_ALIGN(addr, pgoff);
 165         else
 166                 addr = PAGE_ALIGN(addr);
 167
 168         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
 169                 /* At this point:  (!vma || addr < vma->vm_end). */
 170                 if (addr < VA_EXCLUDE_START &&
 171                     (addr + len) >= VA_EXCLUDE_START) {
 172                         addr = VA_EXCLUDE_END;
 173                         vma = find_vma(mm, VA_EXCLUDE_END);
 174                 }
 175                 if (unlikely(task_size < addr)) {
 176                         if (start_addr != TASK_UNMAPPED_BASE) {
 177                                 start_addr = addr = TASK_UNMAPPED_BASE;
 178                                 mm->cached_hole_size = 0;
 179                                 goto full_search;
 180                         }
 181                         return -ENOMEM;
 182                 }
 183                 if (likely(!vma || addr + len <= vma->vm_start)) {
 184                         /*
 185                          * Remember the place where we stopped the search:
 186                          */
 187                         mm->free_area_cache = addr + len;
 188                         return addr;
 189                 }
 190                 if (addr + mm->cached_hole_size < vma->vm_start)
 191                         mm->cached_hole_size = vma->vm_start - addr;
 192
 193                 addr = vma->vm_end;
 194                 if (do_color_align)
 195                         addr = COLOUR_ALIGN(addr, pgoff);
 196         }
 197 }
 198
 199 unsigned long
 200 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 201                           const unsigned long len, const unsigned long pgoff,
 202                           const unsigned long flags)
 203 {
 204         struct vm_area_struct *vma;
 205         struct mm_struct *mm = current->mm;
 206         unsigned long task_size = STACK_TOP32;
 207         unsigned long addr = addr0;
 208         int do_color_align;
 209
 210         /* This should only ever run for 32-bit processes.  */
 211         BUG_ON(!test_thread_flag(TIF_32BIT));
 212
 213         if (flags & MAP_FIXED) {
 214                 /* We do not accept a shared mapping if it would violate
 215                  * cache aliasing constraints.
 216                  */
 217                 if ((flags & MAP_SHARED) &&
 218                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 219                         return -EINVAL;
 220                 return addr;
 221         }
 222
 223         if (unlikely(len > task_size))
 224                 return -ENOMEM;
 225
 226         do_color_align = 0;
 227         if (filp || (flags & MAP_SHARED))
 228                 do_color_align = 1;
 229
 230         /* requesting a specific address */
 231         if (addr) {
 232                 if (do_color_align)
 233                         addr = COLOUR_ALIGN(addr, pgoff);
 234                 else
 235                         addr = PAGE_ALIGN(addr);
 236
 237                 vma = find_vma(mm, addr);
 238                 if (task_size - len >= addr &&
 239                     (!vma || addr + len <= vma->vm_start))
 240                         return addr;
 241         }
 242
 243         /* check if free_area_cache is useful for us */
 244         if (len <= mm->cached_hole_size) {
 245                 mm->cached_hole_size = 0;
 246                 mm->free_area_cache = mm->mmap_base;
 247         }
 248
 249         /* either no address requested or can't fit in requested address hole */
 250         addr = mm->free_area_cache;
 251         if (do_color_align) {
 252                 unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff);
 253
 254                 addr = base + len;
 255         }
 256
 257         /* make sure it can fit in the remaining address space */
 258         if (likely(addr > len)) {
 259                 vma = find_vma(mm, addr-len);
 260                 if (!vma || addr <= vma->vm_start) {
 261                         /* remember the address as a hint for next time */
 262                         return (mm->free_area_cache = addr-len);
 263                 }
 264         }
 265
 266         if (unlikely(mm->mmap_base < len))
 267                 goto bottomup;
 268
 269         addr = mm->mmap_base-len;
 270         if (do_color_align)
 271                 addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 272
 273         do {
 274                 /*
 275                  * Lookup failure means no vma is above this address,
 276                  * else if new region fits below vma->vm_start,
 277                  * return with success:
 278                  */
 279                 vma = find_vma(mm, addr);
 280                 if (likely(!vma || addr+len <= vma->vm_start)) {
 281                         /* remember the address as a hint for next time */
 282                         return (mm->free_area_cache = addr);
 283                 }
 284
 285                 /* remember the largest hole we saw so far */
 286                 if (addr + mm->cached_hole_size < vma->vm_start)
 287                         mm->cached_hole_size = vma->vm_start - addr;
 288
 289                 /* try just below the current vma->vm_start */
 290                 addr = vma->vm_start-len;
 291                 if (do_color_align)
 292                         addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 293         } while (likely(len < vma->vm_start));
 294
 295 bottomup:
 296         /*
 297          * A failed mmap() very likely causes application failure,
 298          * so fall back to the bottom-up function here. This scenario
 299          * can happen with large stack limits and large mmap()
 300          * allocations.
 301          */
 302         mm->cached_hole_size = ~0UL;
 303         mm->free_area_cache = TASK_UNMAPPED_BASE;
 304         addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
 305         /*
 306          * Restore the topdown base:
 307          */
 308         mm->free_area_cache = mm->mmap_base;
 309         mm->cached_hole_size = ~0UL;
 310
 311         return addr;
 312 }
 313
 314 /* Try to align mapping such that we align it as much as possible. */
 315 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 316 {
 317         unsigned long align_goal, addr = -ENOMEM;
 318
 319         if (flags & MAP_FIXED) {
 320                 /* Ok, don't mess with it. */
 321                 return get_unmapped_area(NULL, orig_addr, len, pgoff, flags);
 322         }
 323         flags &= ~MAP_SHARED;
 324
 325         align_goal = PAGE_SIZE;
 326         if (len >= (4UL * 1024 * 1024))
 327                 align_goal = (4UL * 1024 * 1024);
 328         else if (len >= (512UL * 1024))
 329                 align_goal = (512UL * 1024);
 330         else if (len >= (64UL * 1024))
 331                 align_goal = (64UL * 1024);
 332
 333         do {
 334                 addr = get_unmapped_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
 335                 if (!(addr & ~PAGE_MASK)) {
 336                         addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
 337                         break;
 338                 }
 339
 340                 if (align_goal == (4UL * 1024 * 1024))
 341                         align_goal = (512UL * 1024);
 342                 else if (align_goal == (512UL * 1024))
 343                         align_goal = (64UL * 1024);
 344                 else
 345                         align_goal = PAGE_SIZE;
 346         } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
 347
 348         /* Mapping is smaller than 64K or larger areas could not
 349          * be obtained.
 350          */
 351         if (addr & ~PAGE_MASK)
 352                 addr = get_unmapped_area(NULL, orig_addr, len, pgoff, flags);
 353
 354         return addr;
 355 }
 356
 357 /* Essentially the same as PowerPC... */
 358 void arch_pick_mmap_layout(struct mm_struct *mm)
 359 {
 360         unsigned long random_factor = 0UL;
 361
 362         if (current->flags & PF_RANDOMIZE) {
 363                 random_factor = get_random_int();
 364                 if (test_thread_flag(TIF_32BIT))
 365                         random_factor &= ((1 * 1024 * 1024) - 1);
 366                 else
 367                         random_factor = ((random_factor << PAGE_SHIFT) &
 368                                          0xffffffffUL);
 369         }
 370
 371         /*
 372          * Fall back to the standard layout if the personality
 373          * bit is set, or if the expected stack growth is unlimited:
 374          */
 375         if (!test_thread_flag(TIF_32BIT) ||
 376             (current->personality & ADDR_COMPAT_LAYOUT) ||
 377             current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY ||
 378             sysctl_legacy_va_layout) {
 379                 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
 380                 mm->get_unmapped_area = arch_get_unmapped_area;
 381                 mm->unmap_area = arch_unmap_area;
 382         } else {
 383                 /* We know it's 32-bit */
 384                 unsigned long task_size = STACK_TOP32;
 385                 unsigned long gap;
 386
 387                 gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
 388                 if (gap < 128 * 1024 * 1024)
 389                         gap = 128 * 1024 * 1024;
 390                 if (gap > (task_size / 6 * 5))
 391                         gap = (task_size / 6 * 5);
 392
 393                 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
 394                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 395                 mm->unmap_area = arch_unmap_area_topdown;
 396         }
 397 }
 398
 399 asmlinkage unsigned long sparc_brk(unsigned long brk)
 400 {
 401         /* People could try to be nasty and use ta 0x6d in 32bit programs */
 402         if (test_thread_flag(TIF_32BIT) && brk >= STACK_TOP32)
 403                 return current->mm->brk;
 404
 405         if (unlikely(straddles_64bit_va_hole(current->mm->brk, brk)))
 406                 return current->mm->brk;
 407
 408         return sys_brk(brk);
 409 }
 410
 411 /*
 412  * sys_pipe() is the normal C calling standard for creating
 413  * a pipe. It's not the way unix traditionally does this, though.
 414  */
 415 asmlinkage long sparc_pipe(struct pt_regs *regs)
 416 {
 417         int fd[2];
 418         int error;
 419
 420         error = do_pipe(fd);
 421         if (error)
 422                 goto out;
 423         regs->u_regs[UREG_I1] = fd[1];
 424         error = fd[0];
 425 out:
 426         return error;
 427 }
 428
 429 /*
 430  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 431  *
 432  * This is really horribly ugly.
 433  */
 434
 435 asmlinkage long sys_ipc(unsigned int call, int first, unsigned long second,
 436                         unsigned long third, void __user *ptr, long fifth)
 437 {
 438         long err;
 439
 440         /* No need for backward compatibility. We can start fresh... */
 441         if (call <= SEMCTL) {
 442                 switch (call) {
 443                 case SEMOP:
 444                         err = sys_semtimedop(first, ptr,
 445                                              (unsigned)second, NULL);
 446                         goto out;
 447                 case SEMTIMEDOP:
 448                         err = sys_semtimedop(first, ptr, (unsigned)second,
 449                                 (const struct timespec __user *) fifth);
 450                         goto out;
 451                 case SEMGET:
 452                         err = sys_semget(first, (int)second, (int)third);
 453                         goto out;
 454                 case SEMCTL: {
 455                         err = sys_semctl(first, third,
 456                                          (int)second | IPC_64,
 457                                          (union semun) ptr);
 458                         goto out;
 459                 }
 460                 default:
 461                         err = -ENOSYS;
 462                         goto out;
 463                 };
 464         }
 465         if (call <= MSGCTL) {
 466                 switch (call) {
 467                 case MSGSND:
 468                         err = sys_msgsnd(first, ptr, (size_t)second,
 469                                          (int)third);
 470                         goto out;
 471                 case MSGRCV:
 472                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
 473                                          (int)third);
 474                         goto out;
 475                 case MSGGET:
 476                         err = sys_msgget((key_t)first, (int)second);
 477                         goto out;
 478                 case MSGCTL:
 479                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
 480                         goto out;
 481                 default:
 482                         err = -ENOSYS;
 483                         goto out;
 484                 };
 485         }
 486         if (call <= SHMCTL) {
 487                 switch (call) {
 488                 case SHMAT: {
 489                         ulong raddr;
 490                         err = do_shmat(first, ptr, (int)second, &raddr);
 491                         if (!err) {
 492                                 if (put_user(raddr,
 493                                              (ulong __user *) third))
 494                                         err = -EFAULT;
 495                         }
 496                         goto out;
 497                 }
 498                 case SHMDT:
 499                         err = sys_shmdt(ptr);
 500                         goto out;
 501                 case SHMGET:
 502                         err = sys_shmget(first, (size_t)second, (int)third);
 503                         goto out;
 504                 case SHMCTL:
 505                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
 506                         goto out;
 507                 default:
 508                         err = -ENOSYS;
 509                         goto out;
 510                 };
 511         } else {
 512                 err = -ENOSYS;
 513         }
 514 out:
 515         return err;
 516 }
 517
 518 asmlinkage long sparc64_newuname(struct new_utsname __user *name)
 519 {
 520         int ret = sys_newuname(name);
 521
 522         if (current->personality == PER_LINUX32 && !ret) {
 523                 ret = (copy_to_user(name->machine, "sparc\0\0", 8)
 524                        ? -EFAULT : 0);
 525         }
 526         return ret;
 527 }
 528
 529 asmlinkage long sparc64_personality(unsigned long personality)
 530 {
 531         int ret;
 532
 533         if (current->personality == PER_LINUX32 &&
 534             personality == PER_LINUX)
 535                 personality = PER_LINUX32;
 536         ret = sys_personality(personality);
 537         if (ret == PER_LINUX32)
 538                 ret = PER_LINUX;
 539
 540         return ret;
 541 }
 542
 543 int sparc64_mmap_check(unsigned long addr, unsigned long len,
 544                 unsigned long flags)
 545 {
 546         if (test_thread_flag(TIF_32BIT)) {
 547                 if (len >= STACK_TOP32)
 548                         return -EINVAL;
 549
 550                 if ((flags & MAP_FIXED) && addr > STACK_TOP32 - len)
 551                         return -EINVAL;
 552         } else {
 553                 if (len >= VA_EXCLUDE_START)
 554                         return -EINVAL;
 555
 556                 if ((flags & MAP_FIXED) && invalid_64bit_range(addr, len))
 557                         return -EINVAL;
 558         }
 559
 560         return 0;
 561 }
 562
 563 /* Linux version of mmap */
 564 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 565         unsigned long prot, unsigned long flags, unsigned long fd,
 566         unsigned long off)
 567 {
 568         struct file * file = NULL;
 569         unsigned long retval = -EBADF;
 570
 571         if (!(flags & MAP_ANONYMOUS)) {
 572                 file = fget(fd);
 573                 if (!file)
 574                         goto out;
 575         }
 576         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 577         len = PAGE_ALIGN(len);
 578
 579         down_write(&current->mm->mmap_sem);
 580         retval = do_mmap(file, addr, len, prot, flags, off);
 581         up_write(&current->mm->mmap_sem);
 582
 583         if (file)
 584                 fput(file);
 585 out:
 586         return retval;
 587 }
 588
 589 asmlinkage long sys64_munmap(unsigned long addr, size_t len)
 590 {
 591         long ret;
 592
 593         if (invalid_64bit_range(addr, len))
 594                 return -EINVAL;
 595
 596         down_write(&current->mm->mmap_sem);
 597         ret = do_munmap(current->mm, addr, len);
 598         up_write(&current->mm->mmap_sem);
 599         return ret;
 600 }
 601
 602 extern unsigned long do_mremap(unsigned long addr,
 603         unsigned long old_len, unsigned long new_len,
 604         unsigned long flags, unsigned long new_addr);
 605
 606 asmlinkage unsigned long sys64_mremap(unsigned long addr,
 607         unsigned long old_len, unsigned long new_len,
 608         unsigned long flags, unsigned long new_addr)
 609 {
 610         struct vm_area_struct *vma;
 611         unsigned long ret = -EINVAL;
 612
 613         if (test_thread_flag(TIF_32BIT))
 614                 goto out;
 615         if (unlikely(new_len >= VA_EXCLUDE_START))
 616                 goto out;
 617         if (unlikely(invalid_64bit_range(addr, old_len)))
 618                 goto out;
 619
 620         down_write(&current->mm->mmap_sem);
 621         if (flags & MREMAP_FIXED) {
 622                 if (invalid_64bit_range(new_addr, new_len))
 623                         goto out_sem;
 624         } else if (invalid_64bit_range(addr, new_len)) {
 625                 unsigned long map_flags = 0;
 626                 struct file *file = NULL;
 627
 628                 ret = -ENOMEM;
 629                 if (!(flags & MREMAP_MAYMOVE))
 630                         goto out_sem;
 631
 632                 vma = find_vma(current->mm, addr);
 633                 if (vma) {
 634                         if (vma->vm_flags & VM_SHARED)
 635                                 map_flags |= MAP_SHARED;
 636                         file = vma->vm_file;
 637                 }
 638
 639                 /* MREMAP_FIXED checked above. */
 640                 new_addr = get_unmapped_area(file, addr, new_len,
 641                                     vma ? vma->vm_pgoff : 0,
 642                                     map_flags);
 643                 ret = new_addr;
 644                 if (new_addr & ~PAGE_MASK)
 645                         goto out_sem;
 646                 flags |= MREMAP_FIXED;
 647         }
 648         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 649 out_sem:
 650         up_write(&current->mm->mmap_sem);
 651 out:
 652         return ret;
 653 }
 654
 655 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 656 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 657 {
 658         static int count;
 659
 660         /* Don't make the system unusable, if someone goes stuck */
 661         if (count++ > 5)
 662                 return -ENOSYS;
 663
 664         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 665 #ifdef DEBUG_UNIMP_SYSCALL
 666         show_regs (regs);
 667 #endif
 668
 669         return -ENOSYS;
 670 }
 671
 672 /* #define DEBUG_SPARC_BREAKPOINT */
 673
 674 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 675 {
 676         siginfo_t info;
 677
 678         if (test_thread_flag(TIF_32BIT)) {
 679                 regs->tpc &= 0xffffffff;
 680                 regs->tnpc &= 0xffffffff;
 681         }
 682 #ifdef DEBUG_SPARC_BREAKPOINT
 683         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 684 #endif
 685         info.si_signo = SIGTRAP;
 686         info.si_errno = 0;
 687         info.si_code = TRAP_BRKPT;
 688         info.si_addr = (void __user *)regs->tpc;
 689         info.si_trapno = 0;
 690         force_sig_info(SIGTRAP, &info, current);
 691 #ifdef DEBUG_SPARC_BREAKPOINT
 692         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 693 #endif
 694 }
 695
 696 extern void check_pending(int signum);
 697
 698 asmlinkage long sys_getdomainname(char __user *name, int len)
 699 {
 700         int nlen, err;
 701
 702         if (len < 0)
 703                 return -EINVAL;
 704
 705         down_read(&uts_sem);
 706
 707         nlen = strlen(utsname()->domainname) + 1;
 708         err = -EINVAL;
 709         if (nlen > len)
 710                 goto out;
 711
 712         err = -EFAULT;
 713         if (!copy_to_user(name, utsname()->domainname, nlen))
 714                 err = 0;
 715
 716 out:
 717         up_read(&uts_sem);
 718         return err;
 719 }
 720
 721 asmlinkage long solaris_syscall(struct pt_regs *regs)
 722 {
 723         static int count;
 724
 725         regs->tpc = regs->tnpc;
 726         regs->tnpc += 4;
 727         if (test_thread_flag(TIF_32BIT)) {
 728                 regs->tpc &= 0xffffffff;
 729                 regs->tnpc &= 0xffffffff;
 730         }
 731         if (++count <= 5) {
 732                 printk ("For Solaris binary emulation you need solaris module loaded\n");
 733                 show_regs (regs);
 734         }
 735         send_sig(SIGSEGV, current, 1);
 736
 737         return -ENOSYS;
 738 }
 739
 740 #ifndef CONFIG_SUNOS_EMUL
 741 asmlinkage long sunos_syscall(struct pt_regs *regs)
 742 {
 743         static int count;
 744
 745         regs->tpc = regs->tnpc;
 746         regs->tnpc += 4;
 747         if (test_thread_flag(TIF_32BIT)) {
 748                 regs->tpc &= 0xffffffff;
 749                 regs->tnpc &= 0xffffffff;
 750         }
 751         if (++count <= 20)
 752                 printk ("SunOS binary emulation not compiled in\n");
 753         force_sig(SIGSEGV, current);
 754
 755         return -ENOSYS;
 756 }
 757 #endif
 758
 759 asmlinkage long sys_utrap_install(utrap_entry_t type,
 760                                   utrap_handler_t new_p,
 761                                   utrap_handler_t new_d,
 762                                   utrap_handler_t __user *old_p,
 763                                   utrap_handler_t __user *old_d)
 764 {
 765         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 766                 return -EINVAL;
 767         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 768                 if (old_p) {
 769                         if (!current_thread_info()->utraps) {
 770                                 if (put_user(NULL, old_p))
 771                                         return -EFAULT;
 772                         } else {
 773                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 774                                         return -EFAULT;
 775                         }
 776                 }
 777                 if (old_d) {
 778                         if (put_user(NULL, old_d))
 779                                 return -EFAULT;
 780                 }
 781                 return 0;
 782         }
 783         if (!current_thread_info()->utraps) {
 784                 current_thread_info()->utraps =
 785                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 786                 if (!current_thread_info()->utraps)
 787                         return -ENOMEM;
 788                 current_thread_info()->utraps[0] = 1;
 789         } else {
 790                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 791                     current_thread_info()->utraps[0] > 1) {
 792                         long *p = current_thread_info()->utraps;
 793
 794                         current_thread_info()->utraps =
 795                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 796                                         GFP_KERNEL);
 797                         if (!current_thread_info()->utraps) {
 798                                 current_thread_info()->utraps = p;
 799                                 return -ENOMEM;
 800                         }
 801                         p[0]--;
 802                         current_thread_info()->utraps[0] = 1;
 803                         memcpy(current_thread_info()->utraps+1, p+1,
 804                                UT_TRAP_INSTRUCTION_31*sizeof(long));
 805                 }
 806         }
 807         if (old_p) {
 808                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 809                         return -EFAULT;
 810         }
 811         if (old_d) {
 812                 if (put_user(NULL, old_d))
 813                         return -EFAULT;
 814         }
 815         current_thread_info()->utraps[type] = (long)new_p;
 816
 817         return 0;
 818 }
 819
 820 long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
 821 {
 822         if (model >= 3)
 823                 return -EINVAL;
 824         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 825         return 0;
 826 }
 827
 828 asmlinkage long sys_rt_sigaction(int sig,
 829                                  const struct sigaction __user *act,
 830                                  struct sigaction __user *oact,
 831                                  void __user *restorer,
 832                                  size_t sigsetsize)
 833 {
 834         struct k_sigaction new_ka, old_ka;
 835         int ret;
 836
 837         /* XXX: Don't preclude handling different sized sigset_t's.  */
 838         if (sigsetsize != sizeof(sigset_t))
 839                 return -EINVAL;
 840
 841         if (act) {
 842                 new_ka.ka_restorer = restorer;
 843                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 844                         return -EFAULT;
 845         }
 846
 847         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 848
 849         if (!ret && oact) {
 850                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 851                         return -EFAULT;
 852         }
 853
 854         return ret;
 855 }
 856
 857 /* Invoked by rtrap code to update performance counters in
 858  * user space.
 859  */
 860 asmlinkage void update_perfctrs(void)
 861 {
 862         unsigned long pic, tmp;
 863
 864         read_pic(pic);
 865         tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 866         __put_user(tmp, current_thread_info()->user_cntd0);
 867         tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 868         __put_user(tmp, current_thread_info()->user_cntd1);
 869         reset_pic();
 870 }
 871
 872 asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
 873 {
 874         int err = 0;
 875
 876         switch(opcode) {
 877         case PERFCTR_ON:
 878                 current_thread_info()->pcr_reg = arg2;
 879                 current_thread_info()->user_cntd0 = (u64 __user *) arg0;
 880                 current_thread_info()->user_cntd1 = (u64 __user *) arg1;
 881                 current_thread_info()->kernel_cntd0 =
 882                         current_thread_info()->kernel_cntd1 = 0;
 883                 write_pcr(arg2);
 884                 reset_pic();
 885                 set_thread_flag(TIF_PERFCTR);
 886                 break;
 887
 888         case PERFCTR_OFF:
 889                 err = -EINVAL;
 890                 if (test_thread_flag(TIF_PERFCTR)) {
 891                         current_thread_info()->user_cntd0 =
 892                                 current_thread_info()->user_cntd1 = NULL;
 893                         current_thread_info()->pcr_reg = 0;
 894                         write_pcr(0);
 895                         clear_thread_flag(TIF_PERFCTR);
 896                         err = 0;
 897                 }
 898                 break;
 899
 900         case PERFCTR_READ: {
 901                 unsigned long pic, tmp;
 902
 903                 if (!test_thread_flag(TIF_PERFCTR)) {
 904                         err = -EINVAL;
 905                         break;
 906                 }
 907                 read_pic(pic);
 908                 tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 909                 err |= __put_user(tmp, current_thread_info()->user_cntd0);
 910                 tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 911                 err |= __put_user(tmp, current_thread_info()->user_cntd1);
 912                 reset_pic();
 913                 break;
 914         }
 915
 916         case PERFCTR_CLRPIC:
 917                 if (!test_thread_flag(TIF_PERFCTR)) {
 918                         err = -EINVAL;
 919                         break;
 920                 }
 921                 current_thread_info()->kernel_cntd0 =
 922                         current_thread_info()->kernel_cntd1 = 0;
 923                 reset_pic();
 924                 break;
 925
 926         case PERFCTR_SETPCR: {
 927                 u64 __user *user_pcr = (u64 __user *)arg0;
 928
 929                 if (!test_thread_flag(TIF_PERFCTR)) {
 930                         err = -EINVAL;
 931                         break;
 932                 }
 933                 err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
 934                 write_pcr(current_thread_info()->pcr_reg);
 935                 current_thread_info()->kernel_cntd0 =
 936                         current_thread_info()->kernel_cntd1 = 0;
 937                 reset_pic();
 938                 break;
 939         }
 940
 941         case PERFCTR_GETPCR: {
 942                 u64 __user *user_pcr = (u64 __user *)arg0;
 943
 944                 if (!test_thread_flag(TIF_PERFCTR)) {
 945                         err = -EINVAL;
 946                         break;
 947                 }
 948                 err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
 949                 break;
 950         }
 951
 952         default:
 953                 err = -EINVAL;
 954                 break;
 955         };
 956         return err;
 957 }
 958
 959 /*
 960  * Do a system call from kernel instead of calling sys_execve so we
 961  * end up with proper pt_regs.
 962  */
 963 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 964 {
 965         long __res;
 966         register long __g1 __asm__ ("g1") = __NR_execve;
 967         register long __o0 __asm__ ("o0") = (long)(filename);
 968         register long __o1 __asm__ ("o1") = (long)(argv);
 969         register long __o2 __asm__ ("o2") = (long)(envp);
 970         asm volatile ("t 0x6d\n\t"
 971                       "sub %%g0, %%o0, %0\n\t"
 972                       "movcc %%xcc, %%o0, %0\n\t"
 973                       : "=r" (__res), "=&r" (__o0)
 974                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 975                       : "cc");
 976         return __res;
 977 }